Explanation: Electron dot structures are the lewis dot structures which represent the number of valence electrons around an atom in a molecule.
The electronic configuration of potassium is ![[Ar]4s^1](https://tex.z-dn.net/?f=%5BAr%5D4s%5E1)
Valence electrons of potassium are 1.
The electronic configuration of Bromine is ![[Ar]4s^24p^5](https://tex.z-dn.net/?f=%5BAr%5D4s%5E24p%5E5)
Valence electrons of bromine are 7.
These two elements form ionic compound.
Ionic compound is defined as the compound which is formed from the complete transfer of electrons from one element to another element.
Here, one electron is released by potassium which is accepted by bromine element. In this process, Potassium becomes cation having +1 charge and Bromine become anion having (-1) charge.
The ionic equation follows:
The electron dot structure is provided in the image below.
The reaction is incorrect. The correct reaction is: Na₂SO₄ + Hg(NO₃)₂ → HgSO₄ + 2NaNO₃. The options are:
A. Hg₂SO₄
B. Na₂SO₄
C. Na⁺
D. NO₃⁻
E. SO₄⁻²
F. Hg₂(NO₃)₂
G. NaNO₃
H. Hg⁺²
Answer:
C, D, E, H
Explanation:
The ions are formed after dissociation of the compound in the solution. When they're negatively charged, they're called anions, when they're negatively charged, they're called cations. If the ion is presented on both sides of the reaction, it is called a spectator ion.
Thus, the reaction given:
Na₂SO₄ + Hg(NO₃)₂ → HgSO₄ + 2NaNO₃
So, let's do the dissociation.
Na₂SO₄ is formed by the ions Na⁺ and SO₄⁻²;
Hg(NO₃)₂ is formed by the ions Hg⁺² and NO₃⁻;
HgSO₄ is formed by the ions Hg⁺² and SO₄⁻²;
NaNO₃ is formed by the ions Na⁺ and NO₃⁻.
Thus, the spectator ions are Na⁺, SO₄⁻², Hg⁺², and NO₃⁻.
Answer:
1. Dissolving powder in milk - Chemical
- It is chemical because the milk has changed on a molecular level
2. Toasting bread - Chemical
- It is chemical because adding heat to the bread cooks it, therefore
changing it on a molecular level
3. Melting cheese - Physical
- It is physical because the physical appearance was the only change
4. Slicing apples or bannanas - Physical
- It is physical because the physical appearance was the only change
5. Frying an egg - Chemical
- It is chemical because new particles were formed
6. Milk souring - Chemical
- It is chemical because it is forming a new product (lactic acid)
Explanation:
Physical Change occurs when the particles of a substance become rearranged, but do not change into different particles.
Chemical change occurs when a new substance is formed. This process is irreversable.
A. Nonmetallic
B. Nonmetallic
C. Metallic
D. Nonmetallic
E. Metallic
